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Gaya APA

Th.Verstapen, H. (2014). Garis Besar Geomorfologi Indonesia . Yogyakarta: Yogyakarta:UGM.

Gaya MLA

Th.Verstapen, Herman. "Garis Besar Geomorfologi Indonesia". Yogyakarta: Yogyakarta:UGM, 2014. Text.